Add note about diskspace usage of pg_commit_ts

Simon Riggs <simon@2ndQuadrant.com>

Commit: 28915c7db4da4eaffb8eb0dc5c04c87dcf345eb6
Author: Simon Riggs <simon@2ndQuadrant.com>
Date: 2017-09-01T06:55:00Z
Releases: 10.0
Add note about diskspace usage of pg_commit_ts

Author: Thomas Munro

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doc/src/sgml/maintenance.sgml modified +17 −13

Documentation touched